Release v1.2.0

Add Delay option on input to delay the lambda event invocation after it is started

Release v1.1.0

Added util package which contains Response struct representing lambda response. It can be used to incrementally test the response returned by lambda. This way the unmarshall is delayed and expected null field un-marshalling can be avoided

Release v1.0.0

Initial release. Starting from v0.0.4 as fork repo already had three releases and go module complains about local package